Oceans

What do ship captains use to help them know when it is safe to dock at the ocean's edge?

More Questions from Oceans
What is the length of the Caspian Sea?
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What ocean borders China on the east?
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The hadal zone begins at what depth?
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How many collapsible lifeboats did the Titanic carry?
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The "Ring of Fire" is a string of volcanoes in and around what ocean?
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When the ice of the Arctic Ocean melts it releases nutrients and organisms into the water which promotes the growth of what?
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Which of the following is the smallest of the baleen whale species?
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What is the third largest shark in the world?
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